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• Why does everybody have the same MAC address as me?

  - by iblue

  I just bought some consumer-grade McCheap PCI-E NICs (and this was a bad idea). They both have the same MAC address. When I google it, it seems like every card of that company has the same address: 00:50:43:00:45:3e. Shouldn't they be unique? According to lspci it's a Marvell Technology Group Ltd. 88E8053 PCI-E Gigabit Ethernet Controller (rev 20). Is there a way to permanently flash a new address?

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• Would a switch be covered by a router's firewall

  - by Uh-yeah...

  So... Hopefully; this is the right place for this question. I need more Ethernet ports on my home network. Sadly, we already have an old router connected to the main router and we still need more ports. I feel dumb for asking; but, I just would like to double check. Would the devices connected to the switch be "protected" by the Main router's firewall? ? Up to this point I have assumed that was the case; but, a co-worker is convinced that is not the case [ I believe he is thinking of a situation in which the switch (un-managed) is before an access point]. [It would go modem to main router; main router then has the switch and old router connected to it.

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• Unable chage IP address for eth0 without restart in Ubunto

  - by Rodnower

  I have Ubuntu 12.04.1 installed. I try to change IP address of the interface eth0 in /etc/network/interfaces from 192.168.1.3 to 192.168.1.4: auto lo iface lo inet loopback pre-up iptables-restore < /etc/iptables.up.rules auto eth0 iface eth0 inet static address 192.168.1.4 gateway 192.168.1.1 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 sudo service networking status Now I issue: sudo service networking restart I have response: stop: Unknown instance: networking stop/waiting And IP remains 192.168.1.3: eth0 Link encap:Ethernet HWaddr 00:1e:33:71:cd:a4 inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::21e:33ff:fe71:cda4/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3861 errors:0 dropped:0 overruns:0 frame:0 TX packets:3291 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3423285 (3.4 MB) TX bytes:521854 (521.8 KB) Interrupt:45 Base address:0x4000 Only after restart IP changing... Any ideas?

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• Motherboard: Intel S5520HCR s1366 SSI EEB

  - by Crazy_Bash

  I'm building a storage server for online video streaming. I thought about adding two SSD drive for a OS. other 15*(12 SATA & 3 SSD) drives i want to build with aufs XFS and ethernet 4GB/sec network. But I'm confused a little. S5520HCR board supports 6, SATA/300, RAID: 0, 1, 10, Intel ICH10R. Does it mean i can use SATAIII HDD? I'm planing on buying SEAGATE SV35 Series (3.5, 3??, 64??, SATA III-600). also my Chassis supports up-to 16 sata and the motherboard only 6 what kind of sata controller should i use? What's better in terms of performance 1366 or 2011 socket? My server so far: AIC RSC-3EG-80R-SA1S-2 3U Motherboard: Intel S5520HCR s1366 SSI EEB Kingston DDR3 8192Mb PC3-10600 1333MHz (KVR1333D3N9/8G) Seagate 3000GB 64MB 3.5" 7200rpm SATAIII (ST3000DM001) Kingston 480GB SSD 2.5" SATAIII Intel E1G44HTBLK Intel Xeon E5606 2133MHz/L3-8192Kb/QPI s1366 tray SERVER ACC CARD SAS PCIE 16P HBA 9201-16I LSI00244 SGL LSI

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• How to configure multiple addresses on a single interface using Fedora 16

  - by cg.

  I upgraded from Fedora 14 to 16, recently. I had two static IP v4 addresses configured on my ethernet interface by creating two files in /etc/sysconfig/network-scripts: ifcfg-eth0 -> first address ifcfg-eth0:1 -> second address After the upgrade, this resulted in an error message during the boot process and in only the second address being successfully configured on the interface. So, what is the correct way to configure multiple addresses on a single interface on Fedora 16? I could not find anything on this subject in the documentation so far.

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• What is the "real" difference between a NAS and NFS?

  - by warren

  From an end-user perspective, what is the difference between a NAS device and using NFS exports from a file server? They seem to accomplish the same end result. The difference between a SAN and other file storage is related (in my experience) to how they are connected to the server infrastructure. However, the difference between a NAS, connecting over standard ethernet, and NFS (sharing storage off specific servers, also over the network), seems more nebulous. Is there a good reason to pick a NAS filer over NFS on servers?

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• Use LAN to interface Synergy while having WiFi connected to internet

  - by freonix

  Similar question and solution I have LAN and WiFi connection, with the WiFi connected to internet and the LAN is simply connected via an Ethernet cable between two computers. I need to get Synergy working without compromising the WiFi internet. I've tried the solution above but couldn't seem to work. Both of the computer are running Windows XP. Even setting the LAN IP to static and under the same subnet doesn't seem to work. Anyone with similar situation and got Synergy to work? edit : Refined the question for clarity. Also, the computer are able to ping each other. Remote desktop can be accessed as well. I suspect the problem lies in Synergy's configuration.

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• How can I set a network connection as metered?

  - by Sam

  I would like to set a network connection as metered. I can't find how to do this; it seems to have changed in the upgrade from Windows 8 to 8.1. I tried following the steps in the official metered connection FAQ. However, when I open the connection, there is no Data Usage heading nor a Set as a metered connection option. I tried this on two different computers, both running Windows 8.1. I also tried doing this for both wireless and ethernet adaptors. Here's what the connection screen looks like. I've cropped the empty space from the image. How can I set the connection to metered?

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• ZFS on top of iSCSI

  - by Solipsism

  I'm planning on building out a file server using ZFS and BSD, and I was hoping to make it more expandable by attaching drives stored in other machines in the same rack via iSCSI (e.g., one machine is running ZFS, and others have iSCSI targets available to be connected to by the ZFS box and added to zpools). Looking for other people who have tried this has pretty much lead me to resources about exposing iSCSI shares on top of ZFS, but nothing about the reverse. Primarily I have the following questions: Is iSCSI over gigabit ethernet fast enough for this purpose, or would I have to switch to 10GbE to get decent performance? What would happen when one of the machines running iSCSI targets disconnects from the network? Is there a better way to do this that I just am not clever enough to have realized? Thanks for any help.

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• Host data transfer limit calculations and network protocol headers

  - by UpTheCreek

  OK, this might be a really stupid question, but... I'm building a web app that utilises websockets. There's fairly rapid messaging going on, so I've been taking a look at the network traffic with wireshark, to see if there's any way of reducing the amount of data we are sending over the wire, and hence costs. A typical message has approx 150 byte data payload, and according to wireshark the lower layer stuff takes up about: Ethernet: 14 bytes IP: 20 Bytes TCP: 20 Bytes My question is, are these network headers included in data transfer calculations? What about TCP ACK messages? (another 54 bytes according to wireshark) This may seem petty, but because we have so much messaging going on, and because the payload is a similar size to these headers, it's significant.

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• Impossible do find motherboard drivers to Dell Dimension 3000

  - by Masziej

  Hello, I recently formatet and reinstalled XP on my girlfriends computer. Ive had this computer since 2001, never formatet it, until now =) Anyway the problem is that i cant find any drivers for the motherboard (integrated audio, video and ethernet). as i said its an old ass Dell. Cant remember if I got any cds along with it. Even if i did theyre gone a long time ago. So, I ran CPUZ and got this: --Motherboard-- Dell Computer Corp. Model 0K8980 And started googling. But didnt find any drivers. Still cant So im asking for a little help here. I really need to get the computer going before she wants a new one :D And yes i have looked on dells homesite, but they dont seem to wanna host drivers for their old stuff

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• Citrix Xen VM's lose networking

  - by Ash

  My client has a XenServer 6.0.2 installation with 2 Window Server 2008 R2 virtual machines. Whenever the virtual machines are rebooted they lose their IP settings (IP address, subnet, gateway). Each time after a reboot I need to login to each VM via XenCenter and re-apply the required static IP settings. This causes issues with connected iSCSI drives within each VM - drives need to be reconnected after each reboot. For example, a network adapter has the following settings pre-reboot: Description . . . . . . . . . . . : Citrix PV Ethernet Adapter #0 Physical Address. . . . . . . . . : C6-FB-A2-4F-2C-F3 IPv4 Address. . . . . . . . . . . : 10.101.0.101(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 10.101.0.10 DNS Servers . . . . . . . . . . . : 10.101.0.100 NetBIOS over Tcpip. . . . . . . . : Enabled Post-reboot: Description . . . . . . . . . . . : Citrix PV Ethernet Adapter #0 Physical Address. . . . . . . . . : C6-FB-A2-4F-2C-F3 Autoconfiguration IPv4 Address. . : 169.254.153.174(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : DNS Servers . . . . . . . . . . . : 10.101.0.100 NetBIOS over Tcpip. . . . . . . . : Enabled Under XenCenter -- Virtual Network Interfaces, each adapter is set to a static MAC address (i.e. "Use this MAC address"). I have tried the following commands within one VM but this had no effect: netsh winsock reset catalog netsh int ip reset Can someone please help?

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• Network tries to reindentify itself now and then

  - by Don Young

  When the computer starts up it connects itself to the router (ZTE 4G router) automatically, but after I have surfed the web for a while, it tries to identify itself, meaning you get that little blue circle next to the little screen at the corner. When browsing it does not cause any problems, but if I'm streaming a video the video will then stop, I'll have to refresh the page to make the video start again. And if I'm playing a game, LoL for example, the game will freeze for about 2 seconds then continue again (due to lost connection to the internet). I have no virus on my computer, although I had before. I have reset my router, restarted my computer, updated my ethernet driver, checked so that the IPv4 is set on automatic and tried different router channels. I have had this router for a few months and the problem just started recently. Here is the ipconfig screen:

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• Windows 7 - all usb devices go to sleep im idle mode

  - by dvdx

  A strange thing happened after a few updates to the system: Intel rapid storage SSD firmware update Intel Ethernet adapter update GPU Intel update When the computer turns off the screen (after 5 min), an unknown time later, all the USB devices stop working. Sound card Mouse Keybord etc. I can't turn them back on, so I can't wake up the screen or do anything except turn the computer off and back on. I checked my power save profile and all is OK there. I changed in the Device Manager, the Allow USB to sleep in all the hubs. How can I fix this??

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• How do I bridge connections in Debian?

  - by Josh

  In windows I can select Local Area Connection and Wireless Network Connection, right click and select Bridge Connections How can I achieve the same effect in Linux? (Debian to be exact) Pretty much I want Computer B to connect to Computer A via ethernet cable. Well Computer A is connected wirelessly. Allowing Computer B to get on the internet. == UPDATE == I've enabled IP forwarding and used the following iptables command: iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE I'm still unable to access the internet from Computer B though.

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• Two routers in a LAN

  - by taxi

  router A no wifi +--- pc01 +--- pc02 | +--- router B wifi +--- pc03 +--- printer In my LAN I have a modem-router (say A) (no wifi connection) acting as DHCP server, and connected to the Internet. Now, I want to add another router (say B) (with wifi connection) to the LAN, in order to connect wifi pc's and net printers. Here I would disable DCHP server functionality. Is it correct to connect router B to router A via an ethernet port? In router A I define an IP address (eg 192.168.1.100) to be assigned to router B (MAC address). I expect to see router B listed as an attached device, in router A's status, but on the contrary it is not listed.

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• Chrome Residual Redirect to Login Page

  - by Shadow503

  My college redirects people in the dorms to a login page when using an ethernet (or wifi) connection. I am now at home, and certain domains keep redirecting to this login page. I've tried running ipconfig /flushdns and I flushed the chrome's local dns cache as described here: How to clear/flush the DNS cache in Google Chrome?. Interestingly enough, while http://www.reddit.com redirects to the login page, http://www.reddit.com/r/funny works. Firefox works fine for both urls. Is there a way to fix this without deleting all of my cookies? Thanks!

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• Frequent connection drops when playing online games (StarCraft 2, Battlefield 3) and behind NAT - how to diagnose?

  - by Moshev

  I am having some trouble with (I suspect) my wireless router. It's connected to the internet with a regular lan cable and has a static, public IP address. Our two home PCs connect to the router with regular lan cables, plus there's a laptop which connects over wifi. diagram: Internet | | <- isp-supplied cat5 ethernet cable | D-Link D300 ...wifi... laptop / \ / <- cable -> \ PC1 PC2 The PCs and laptop are behind NAT and share the router's public IP. The router is a D-Link D300. PC1 is used for online gaming and I'm experiencing frequent "connection dropped" errors when playing Battlefield 3, StarCraft 2 and the Diablo 3 beta; but not with TeamFortress 2 or the Tribes Ascend beta. The issue goes away when I remove the router and connect PC1 directly to the ISP's cable. I have also tried disconnecting PC2 and the laptop, leaving PC1 as the only machine connected to the router - doesn't help. How can I diagnose what precisely the issue is?

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• Network not detected, but internet working

  - by Dave

  I am using a brand new HP computer with Windows 7 64 bit. When I first hooked it up it detected my network (hooked up through ethernet) easily. However, after I uninstalled Norton Internet Security, it stopped being able to detect my home network. I can still use the internet as if connected, but I can't go into the network options to communicate with other computers. I had this same problem on Windows Vista on my previous computer. Is there any way to fix this so it detects the network?

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• Network Performance issue

  - by qubemarker

  We have three Ubuntu 10.04 servers. One server is a storage server and the other two servers are configured as clients. The storage server has a good amount of capacity and it is integrated with windows Active directory server for Authentication. I am uploading some video files from both clients to the server and when I am uploading data from any one client alone I get about 26 MB/s data transfer rate. When I upload data from both the clients simultaneously I am only getting about 8 MB/s from each client. I have gigabit ethernet cards in all of the servers and a L2 Managed gigabit switch for connectivity. I don’t know why the data transfer rate is decreasing so much in simultaneous read and write. I have tried all of the TCP stack related settings suggested here. Can any assist with getting better read/write performance out of this setup? Any help is appreciated.

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• Configure clients to navigate through specific wan. Pfsense

  - by leandronn

  I have a machine with a pfsense running. It is configured with three ethernet cards. LAN 192.168.2.1/21 WAN1 200.41.X.2/24 WAN2 200.41.X.3/24 ISP Gateway 200.41.X.1 This is a connection with 5 different IP addresses. WAN1 and WAN2 are directly connected to my ISP router. I need a way to configure some clients navigating through WAN1 and some through WAN2. I am new to pfsense so, please, if you can send me some examples to do this. I can add two squids if it is necessary. Thanks a lot.

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• Is there other usage of Comcast extension cable and splitter?

  - by Tim

  I have an unused Comcast high-speed internet self-install kit from 2006. It has two coils of extension cable, and a splitter, and some screws. The name of the cable is "extension cable" printed on the package. I wonder if that is its actual name? As ethernet cables are always useful, I wonder if the extension cables are totally worthless and should be tossed into a trash can? Or are they usable for some other purposes, or even sellable? Thanks! SVI Digital SV-2G Splitter (5/1000MHz): One interface of the cables: Screws

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• wireless printer - entering WPA - is there a quicker way?

  - by camcam

  I have a wireless printer (Brother DCP-585CW). The wireless setup instruction says I should enter the WPA key to the printer. The key is entered using up and down buttons on the printer. So, I am supposed to enter 64 characters using up and down buttons. To enter 1 character, it takes on average (24+10)/2 = 17 times pressing the button (digits start after 24 letters). So 17*64 = 1088 times. Is there a quicker way to setup a wireless printer? Maybe there is a Windows program that discovers printers connected to computer through USB or Ethernet (my printer has both sockets) and allows to pre-configure it for wireless usage (enter the long WPA key)? Update There is BRAdmin program and it allows to set up almost all wireless settings... almost - all except WPA :(

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• Wifi Signal Strengths

  - by Phorce

  I hope that I have asked this question in the right topic. Basically I use BT (In the U.K.) and I have problems with my router receiving a strong signal in certain rooms of the house, which, therefore makes the internet really slow in some cases it won't work at all. I have had experience working with Virgin Media (UK) before and just changed the channel number and this worked fine, but, do not know if I would receive the same outcome on BT. Could anyone suggest any other things that I could try alongside of the channel change in order to /hopefully/ get a stronger signal, without having to install Ethernet cable?

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• D Link DSL G624T Router will work wirelessly but not via cable

  - by Andy Fensome

  I have a D Link router which works in providing a wireless internet connection for my main PC and secondary notebook. I have been advised that the internet connection to the main pc will be better if I wire the router directly to the PC. I have tried this and can not get a connection. I just keep getting the message network cable unplugged. I have had the ethernet adaptor checked out on the pc and the cable is good ( also checked out). Anything I can do or do I have a bad router. I have tried the cable in all 4 ports and the message is still the same.

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